4/5/2023 0 Comments Flycut pistons yourself![]() Whether one decides to use this replacement piston is entirely his choice, it is important for the user to understand what is being lost. Without the proper piston, you will not realize the power and efficiency of the design. Flat top pistons are not designed specifically for the unique combustion chamber design of the MEL. You will get less performance and bad combustion. Why is replacement piston design so important for the proper operation of this engine design? If you change one of these components by using flat top pistons you have changed the most important thing of this engine. Since the two surfaces of the combustion chamber (cylinder wall and bottom of head) are precision machined, and the third surface (top of piston) is smoothly cast, closer tolerances are maintained, resulting in better regulation of compression ratio. The combustion chambers-in-block are formed by casting the top of each cylinder bank on a ten degree angle to the piston. The MEL cylinder bore is therefore the combustion chamber. Therefore when you bolt on flat head surface with valves also flush with the flat surface, what you have is a valve opening into a cylinder bore, rather than into a combustion chamber in the head. Put differently the MEL cylinder bore is sliced off at an angle. Each cylinder features an angle wedge combustion chamber at the top of the cylinder bores. What is the difference with other engine designs? The difference is that the combustion chamber is defined by piston dome design and not the combustion chamber design in the cylinder head itself, as it is in most other designs. I hope other members can contribute more specific information according the different years and applications. I focussed on the more general topic at hand. I'm only a novice enthusiast so I'm likely to misinterpret one important thing and completely forget another crucial thing. I'll keep changing this first post accordingly. I only included those parts vendors that forum members actually bought from and wrote about their (dis)satisfaction.Ī request: please correct or add to my first post in your replies by rewriting the relevant paragraph yourself. Having the information in one thread seems worthwhile. KULTULZ wrote a lot on the subject on both forums. This thread is assembled by copy/pasting and reorganising info posted before on as well as the old and new MEL Engine Forum. The topic at hand is why they should buy OEM stepdesign pistons (not to be confused with a pop-up design) & where they should buy OEM design pistons. It provides information to all MEL owners who need a new set of pistons. This thread is about MEL combustion chamber & piston design.
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